The OPP said Wednesday that tests have confirmed Samuel Masih's body was found in the burnt vehicle in Oro-Medonte Township last week, along with the remains of a four-year-old boy and a 10-year-old boy.

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The three bodies found in a burnt car near Barrie, Ont., last week are those of a Mississauga father and his two sons.

Samuel Masih and his two sons were first reported missing in Peel Region in the early hours of Friday morning. Police began an investigation.

A few hours later, a vehicle fire was reported on Holick Road in Oro-Medonte Township, near Barrie.

Three bodies were found inside the vehicle.

Testing has since identified the remains of the 36-year-old Masih and his four- and 10-year-old sons.

At this point, police say they believe the person responsible for the deaths is among the deceased.

The OPP says it has been working with Peel Regional Police since shortly after the discovery of the remains in the vehicle. But the connection between the two cases was not publicized initially, in part to give the family some privacy.

Police have been speaking to neighbours and family of the deceased through their investigation.

"This is a very, very tragic set of circumstances which has unfolded," OPP Sgt. Peter Leon told CBC News in a telephone interview.

Police are not releasing a cause of death at this time.

The circumstances remain under investigation by the OPP.

"We do have some investigative questions that still need to be answered and we're hopeful that members of the public may be able to assist us with completing our investigative timeline," Leon said.

Anyone with information is asked to contact the OPP at 1-888-310-1122.